dhcp.h

此文档为采用FPGA实现的以太网MAC层

#include "sys.h"

#define DHCP_REFRESH_INTERVAL 3600*4


typedef struct
{
    Uint8 opcode;
    Uint8 hw_type;
    Uint8 hw_addrlen;
    Uint8 hop_count;
    Uint16 xid_h;
    Uint16 xid_l;
    Uint16 secnum;
    Uint16 flags;
    Uint16 clientip_h;
    Uint16 clientip_l;
    Uint16 yourip_h;
    Uint16 yourip_l;
    Uint16 serverip_h;
    Uint16 serverip_l;
    Uint16 gwip_h;
    Uint16 gwip_l;
    Uint8 clienthw_addr[16];
    Uint8 server_hostname[64];
    Uint8 boot_fileman[128];
    Uint16 magic_cookie_h;
    Uint16 magic_cookie_l;
} DHCP_HEADER;


#define DHCP_SIZE sizeof(DHCP_HEADER)

typedef struct
{
    Uint8 opcode;
    Uint8 len;
} DHCP_OPT;

#define DHCPOPT_SIZE sizeof(DHCP_OPT)

void dhcp_sendack(Uint16 ip_h, Uint16 ip_l, Uint16 serverip_h, Uint16 serverip_l);
void dhcp_getip(void);
void dhcp_parse(DHCP_HEADER *dhcp_packet,Uint16 srcip_h,Uint16 srcip_l);




#define DHCP_OFFSET (ETH_SIZE+IP_SIZE+UDP_SIZE)
#define DHCPOPT_ROOT (DHCP_OFFSET+DHCP_SIZE)